7
BREATHING AIR REQUIREMENTS
AIR QUALITY
The Ambient Air pump’s inlet muffler must be located in a clean breathable air location at all times.
The breathable air drawn into the inlet muffler must meet the requirements of local or provincial regulations. As a minimum, breathing
air should meet the requirements for breathing air as recommended by the Canadian Standards Association under CSA Z-180.1. A
summary of the breathing air requirements are provided below; for complete details, refer to the standard.
Allowable Concentrations of Components for Compressed Breathing Air
(by volume, measured at 21ºC [69.8ºF] and 101.3 kPa [14.7 psia])
Oxygen 20-22%
Nitrogen and rare gases 78-80%
Carbon monoxide 5 mL/m
3
* (ppm)
Carbon dioxide 500 mL/m
3
(ppm)
Methane 10 mL/m
3
(ppm)
Volatile non-methane
hydrocarbons
5 mL/m
3
(ppm) as methane equivalents
Volatile halogenated
hydrocarbons
5 mL/m
3
(ppm)
Oil, particulate, and
condensates
1 mg/m
3
Odours Any pronounced odour detected by smell in a compressed breathing air sample being analyzed
shall be cause for failure of the sample. The source and nature of the odour shall be investigated and
resolved.
Notes:
*1 mL/m
3
= 1 ppm by volume.
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